Fluid moving machine



March 7, 1967 P.HAMMELMANN 3,307,484

FLUID MOVING MACHINE Filed Feb. 24. 1965 4 Sheets-Sheet l Fig. 7

/n Vemor:

March 7, 1967 P. HAMMELMANN -FLUID MOVING MACHINE Filed Feb. 24, 1965 4Sheets-Sheet 2 March 7, 1967k P. HAMMELMANN 3,307,484

FLUID MOVING MACHINE Filed Feb. 24, 1965 4 Sheets-Sheet 3 Fig. 5

Invent or:

March 7, 1967 P. HAMMELMANN 3,307,484 I FLUID MOVING MACHINE Filed Feb.24, 1965 4 sheetssheet 4 /n Venier:

United States Patent FLUID MOVNG MACH-HNE Paul Hammelmann, Zum Sundern17,

Oelde in Westphalia, Germany Filed Feb. 24, 196s, ser. No. 434,986

Claims priority, application Germany, Feb. 27, 1964, H 51,860; May 21,1964, H 52,745 11 Claims. (Cl. 10S-51) The present invention relates toa fluid moving machine, and more particularly to a double acting plungerpump and hydraulic motor combination with a pair of pump chambers.

For hydrodynamic cleaning operations, particularly for the cleaning ofsewers and for mines, water pumps are required which combine a very lowweight with easy adjustability of the pumped Iamount and of the waterpressure. Due to -the fact that very great energy amounts are involved,great efficiency of the pumps is required. Furthermore, the pumpsserving these purposes should require very little service.

Pressure water pumps of high efficiency are known. Three plunger pumpsyare Widely used, particularly for the supply of water to boilers.Multistage rotary pumps operate at lower efliciency, but serves thepurpose. Both pump types are adjustable to ya certain extent, but whenthe pump is adjusted to a different output, the efficiency is reduced.

Piston pumps require very heavy crank drives with cross heads, and thecomparatively low rotary speed of this type of pumps necessitates theuse of reduction gears, and the great torques involved yrequire veryheavy constructions.

When high pressure pumps are improperly controlled, the pumping pressureis exerted against closed valves. In. order to avoid very serious damage-to the pumps under such circumstances, substantial expenditures arerequired. The heat created by friction at the sealing means of theplunger may cause the destruction, or substantial damage -to the sealingmeans, and when the plungers or cylinders are chrome plated, thechromium layer may peel off.

It is one object of the invention to overcome the disadvantages of knownpump constructions, and to provide a fluid moving machine which operatesat high efliciency at high loads and pressures.

Another object of the invention is to provide a fluid moving machineconstructed of simple parts and having a low weight per unit of pumpfluid and pressure.

Another object -of the invention is to provide a fluid movingmachineoperable free of vibrations in all positions.

With these objects in View, vthe present invention relates` to a fluidmoving machine in which plunger means are operated by a driving fluid topump another fluid.

One embodiment of the invention includes a double plunger pump with lapair of pump chambers, and having a double plunger in the form ofcylindrical piston means and slida'bly guided on a stationary part forreciprocating movement during which a valve controlling the supply anddischarge of a driving fluid to the interior of the plunger is operated.

A preferred embodiment of the invention comprises housing means formedwit-h an inner cavity for a pumped fluid, and including a partitionmeans dividing the cavity into two rooms which have first inlet andoutlet means; plunger means including a pair of pistons located onopposite sides of the partition means and a tubular member connectingthe pistons and being guided in the partition means; secondinlet andoutlet means for driving fluid which preferably passes through a conduitin a tubular support which extends through the partition means andpasses through the pistons; and valve means for connecting the secondinlet and outlet means with the motor chambers.

The plunger means define in each room of the housing means a pumpchamber communicating with first inlet and outlet means, and -thepistons and tubular member defining with the partition means a pair ofmotor chambers located on opposite sides of the partition means.

The valve means are movable between first and second positions forsupplying the driving fluid to the first motor chamber while dischargingthe same from the same motor chamber, and for supplying the drivingfluid to the second motor chamber while discharging the same from thefirst motor chamber. This causes reciprocation of the plunger meanssince the driving fluid exerts pressure on the pistons, and thereciprocating plunger means, and more particularly the pistons, engage acontrol means which causes shifting of the valve means so thatthereciprocation of the plunger is automatically continued.

The valve means are mounted in the partition means communicating withthe conduit of the tubular support so that driving fluid supplied to, ordischarged from the conduit passes through the valve means into themotor chambers.

The valve means comprise preferably a main valve which distributes thedriving fluid, and a valve control member which is shifted by the movingplunger means and hydraulically controls lthe main valve which has apiston portion moving in a control chamber to which pressure fluid isadmitted under the control of the valve control member.

The valve control member is mounted in the partition means and has endportions projecting into the motor chambers so as to be engaged by theinner surfaces of the pist-ons during the reciprocating movement of theplunger means.

In one embodiment of the invention, the main valve is turnable in thepartition means, and in another embodiment of the invention the mainvalve is mounted in the partition means for translatory movement. Theturnable main valve is preferably controlled by a pair of valve controlmembers which, when shifted by the reciprocating plunger means, open andclose ducts in the partitioning means for supplying pressure fluid tothe control chamber in which the piston portion of the main valve islocated. During each reciprocating stroke -of the plunger, the mainvalve is hydraulically locked, and cannot turn to a position reversingthe flow of the driving fluid to the motor chambers until the valvecontrol member is actuated by the reciprocating plunger means at the endof a reciprocating stroke.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction yand its methodof operation, together with additional objects and advantages thereof,will be best understood from the following description of specificembodiments when read in connection with the accompanying drawings, inwhich:

FIG. l is a longitudinal sectional view of a fluid moving machineaccording to one embodiment of the invention provided with 'a turnablemain valve;

FIG. 2 is a fragmentary longitudinal sectional View illustrating thecenter portion of FIG. l on a larger scale, the section being taken online II-II in FIG. 3;

FIG. 3 is a cross-sectional View taken on line III-III in FIG. 2;

FIG. 4 is a cross-sectional view taken on line IV-IV in FIG. 2; j

FIG. 5 is a fragmentary longitudinal sectional view illustrating thecenter portion of another embodiment of the invention in which the mainvalve is shiftable in a 3 translatory movement, the section being takenon line V-V in FIG. `6;

FIG. 6 is a longitudinal sectional view taken on line VI-VI in FIG. and

FIG. 7 is a cross-sectional view taken on line VII-VII in FIG. 5.

Referring -now to the drawings, and more particularly to FIGS. 1 and T2,a housing has two head portions 1 and 2 with inlet conduit means 3through which a iiuid to be pumped is supplied. Check valve means 50 and51 cover inlets 3b in walls 3a, and open when the corresponding pumpchambers 5 and 6 are expanded and suction is applied to valves 50 and51. A pair of cylindrical housing portions 1a and 2a connect the heads 1and 2 and form outlets communicating with pump chambers 5 and 6 andclosed by valves 52 and 53 from which pumped iiuid is discharged whenthe corresponding pump chambers 5 and 6 are reduced in volume.

The outlets 1b and 2b'V are connected by a tube 4 into which pressureiluid is pumped. A tie rod 4a connects the outlet means 1b and 2b.

A pair of aligned tubular supports 12 and 13 are respectively mountedinthe heads 1 and 2 and secured to the same by nuts 17 and 18 whichengage threaded portions of tubular supports 12 and 13. The inner endsof the tubular supports 12 and 13 are threaded at 9a, see FIG. 2, tosleeve portions 9b of la partition means 9. An annular member 7surrounds the adjacent ends of the tubular members 1a and 2a and hasinner sealing means 7a of annular configuration which form a circulargap with annular sealing means 7b which :are secured to partitioningmeans 9. A tubular member 8 is mounted in this gap for sliding movementand is divided by partitioning means 9. Pistons 19 and 11 are secured tothe ends of tubular member 8 and surround the tubular supports 12 and13. Sealing rings 14 are provided between the tubular supports tand thepistons 10 and 11.

The partition means 9, and pistons 10 and 11 form in the tubular member8 a pair of motor chambers 26 and 28. Pump chambers 5 and 6 are formedin the pump housing 'between the heads 1 and 2 and pistons 111 and 11.Tubular supports 12 and 13 have inner conduits 1S and 16 4for a drivinguid which is supplied to the inlet of conduit at the end of tubularsupport 13, and which is discharged from the outlet of conduit 16 at theend of tubular support 13.

The inner ends of tubular supports 12 and 13 have inner cylindricalsurfaces 13a and 13b in which a main valve 19 is mounted lfor turningmovement. The end portions of main valve 19 abut roller bearing means 20and 21 so that the main valve 19 cannot be axially displaced.

As lbest seen in FIG. 2, main valve 19 has valve channels 24 and 31)which open at the ends of valve 19 into conduits 15 and 16. Valvechannel 3) has two ports 47 and 47a, and valve channel 24 has two ports46 and 46a. In the illustrated position of valve 19, port 47acommunicates with an -opening 29 in tubular support 13 which leads tothe motor chamber 28 within the plunger 8, 11i, 11. Port 46acommunicates with an opening 25 which leads to the motor chamber 26. Inthe illustrated position of main valve 19, ports 47 and 46 are closed,but when main valve 19 is turned, ports 46 and 47 respectivelycommunicate with openings 29 and 25 in tubular supports 13 and 12,respectively, so that driving Huid entering channel 24 from conduit 15passes into motor chamber 28, while the driving liquid is dischargedfrom motor chamber 26 `and channel 3d into the conduit 16 for reversingthe stroke of -plunger 8, 10, 11.

To effect turning of the main valve through 90, the main valve isprovided with a segment-shaped piston portion 35 best seen in FIG. 3.Piston portion 35 has a shorter axial length than the main valve, and islocated in a corresponding control chamber 34 which extends through anangle of 270 to the end faces of a segmentshaped stationary member 36which is secured to the main part of the partition means 9 by a screw45a.

In the position of co-ntrol valve 19 shown in FIGS. 2 and 3, pressureiluid has entered the control chamber 34 through a duct 31 and has urgedcontrol piston portion 35 to the position abutting one end face of stop36. When pressure uid is supplied through duct 42, piston portion 35 isurged away from member 36 and turns the control valve through while thecontrol chamber 45 expands. The turning of the valve is terminated whenpiston portion 35 abuts the other end of member 36.

The supply of pressure Huid to valve control chamber 34, 45 iscontrolled by valve control members 22 and 23 which are mounted forsliding movement in axial direction in corresponding bores of partitionmeans 9. The ends of control members 22, 23 are connected by arcuatelinks 39 :and 38 best seen in FIG. 4. In the position shown in FIG. 2,link 39 abuts an end face of partition means 9 so that valve controlmembers 22, 23 cannot move farther to the right as viewed in FIG. 2.

Valve control members 22, 23 were -placed in this position by piston 11moving to the right as viewed in FIG. 1, and when the plunger moves inthe opposite direction, piston 111 engages with its inner surface theother ends of valve control members 22, 23 and pushes the same to theleft until link 38 abuts a surface of partition means 9.

Control valve member 23 has a thinner central portion forming an annularroom 32 which communicates with duct 31. Valve control member 22 has twothinner portions surrounded yby annular rooms 44 and 44a. In theillustrated position, annular room 44a communicates with duct 42. In theshifted position of valve control member 22, annular room 44communicates with duct 42.

Main valve 19 has two bores 33 and 41 respectively communicating Withchannels 24 and 30. Annular channels 43 `and 411 are provided in tubularsupports 13 and 12, respectively and cooperate with bores 33 and 41. Four bores 39a are provided in partition means 9 Afor connecting theannular channels 40 and 43 with the annular rooms 32, 44, 44a.

Drive iiuid enters through the inlet at the right end of tubular support13 into conduit 15 and flows in the illustrated position of main valve19 into valve channel 24, through port 46a, and opening 25 into motorchamber 26 to act on piston 11 wherelby the plunger moves to the left asviewed in FIG. 1 and reduces the size of pump chamher 6 so that thefluid to 'be pumped is discharged through outlet valve 43 and outletmeans 1b, and also outlet means 2bI which is connected with outlet means1b by the conduit 4. Valve 50 closes due to the pressure in pump chamber6.

The movement of the plunger to the left in the direction of the arrow 27causes piston 1@l to reduce the volume of motor chamber 28 so that thedriving fluid therein Hows through opening 29, port 47a and valvechannel 3i) into the discharge conduit 16 in tubular support 12 and outof the outlet at the left end of tubular support 12 as viewed in FIG. l.

During movement of plunger 8, 11, 1i) to the left, pump chamber 5expands, and fluid to be pumped is sucked through inlet 3 and valve 51into pump chamber 5 while valve 52 closes.

During this reciprocating stroke of the plunger 8, 19, 11, main valve 19is locked in the illustrated position, since t-he pressure -uid inconduit 15 passes through bore 33, annular channel 43, bore 39, annularroom 32 and bore 31 into valve control chamber 34, see also FIG. 3, sothat piston portion 35 is held by the pressure in control chamber 34 inthe illustrated position so that the main valve establishes thenecessary fluid connections for the reciprocating stroke of the plungerto the left.

When the inner surface of piston 19 engages the ends of valve controlmembers 22 and 23, the same are pushed to the left as Viewed in FIGS. 1and 2 until link 38 abuts an end face of partition means 9. In thisposition of valve control members 22, 23, 4bore 42 communicates withannular room 4d of valve control member 22, and bore 33 is separatedfrom annular room 32 of valve control member 23 and thereby from bore 31and valve control chamber 34.

Pressure duid is discharged `from control chamber 34 through bore 31,annular room 32, bore 39a in sleeve 39b, annular channel 40, and bore 41into valve channel 30 which communicates through conduit 16 with theoutlet for the driving fluid.

At the same time, pressure fluid enters from con-duit through valvechannel 24, bore 33, annular channel 43, bore 39e, annular room 44 andbore 42 into control chamber 45 to urge piston portion 35 to move inclockwise direction through 180 until abutting the other end face ofstationary member 36. Valve 19 turns with the piston portion through 180so that in the new position of the Valve, pressure fluid enters fromconduit 15 into valve channel 34 and passes through port 46 and opening29 into motor chamber 28 to drive piston 10 to the right as Viewed inFIG. 1 whereby the volume of pump chamber 5 is reduced and tluid toV bepumped is discharged through valve 52 and outlet means 2b, 4 and 1b.

At the same time, drive fluid discharged from motor chamber 26 passesthrough opening 25 and port 47 into valve 4channel 30 and from thereinto discharge conduit 16.

This stroke of the plunger means 8, 10, 11 is continued until the innersurface 49 of piston 11 engages control members 22 and 23 and shifts thesame to the right to place the same in the condition shown in FIG. 2which causes a corresponding turning of the main valve 19 incounterclockwise direction to the position shown in FIGS. 2 and 3.

In the modied embodiment illustrated in FIGS. 5 and 6, the main valve isnot turned but shifted in a translatory movement by a valve controlmember operated by the pistons of the plunger. The general arrangementofthe vpump component is the same as shown in FIG. l, and the plungermeans 50 has two pistons 67 and 82 guided on tubular suppolts 12' and 13and a tubular portion 8' which slides on a partition means 9. Aringshaped member with inner sealing means, corresponding to members 7,7a described with reference to FIG. 2, surrounds the tubular portion l8of plunger means 5ft, but is not shown in FIGS. 5 and 6. The inner endsof tubular supports'12 and 13' are secured to partition'means 9', andform an inner cylindrical chamber in which the main valve 54 is mountedfor limited axial movement lbetween two end positions. Partitioningmeans 8 has an axial bore in which a valve control member 69 is mountedfor axial movement between two control posirions determined,respectively by abutment of the heads 68 and 83 on end faces ofpartition means 9', as shown in FIG. 6. Drive ilui-d under pressure issupplied through conduit 53a and ows into valve chamber 55, throughchamber portion 56, bore 57 and conduit 58 into motor chamber 59 to moveplunger means 8 to the left in the direction of the arrow 60 in FIG. 5.At the same time, the contracting motor chamber 61 discharges drive uidthrough conduit 62, bore 63, and valve channel 64 into the dischargeconduit 65 of the tubular support 13.

During movement of the plunger means '8' in the direction of the arrow60 in FIG. 5, pump chamber 6 is reduced in velu-me, and pump chamber 5is increased in volume so that fluid is pumped out of outlet 1b, and'sucked into inlet 3 as described with reference to FIG. 1.

At the end of the reciprocating stroke to the left, the inner surface ofpiston 67 engages the head 63 of valve control mem-ber 69 and shift thesame to its other position in which head 68 abuts partition means 9.

Valve control member 69 has a thinner central portion surrounded by anannular room 72 in partition means 9'. A bore 73 in tubular support 13connects annular room 72 with an annular control chamber 70 providedbetween a portion of the main valve 54 and a corresponding face oftubular suport 13. On the other side of main valve 54, a correspondingannular control chamber 74 is provided. Main Valve 54 has a slot 87 intowhich the end portion 86 of the stop screw 85 projects to limittranslatory movement of main valve 54 into end positions, one of whichis illustrated in FIGS. 5 and 6.

When the plunger means 8 has shifted valve control member 69 to theleft, a bore 71 in tubular support 12 and partition means 9 communicateswith annular room 72 so that pressure duid flows from conduit 53a, bore71, annular room 72, and bore 73 into the annular control chamber 70 tomove main valve 54 to the left to its other end position. The othercontrol chamber 74 discharges duid through bores 75, 76, FIG. 5, in thebody of main body 54 into valve channel 64- which communicates with thedischarge conduit 65 in tubular support 13.

In the second position of main valve 54, valve channel 64 registers witha bore 77 communicating with a conduit 58a which opens into motorchamber 59 so that the same is connected to the discharge conduit 65 intubular support 13.

Drive fluid under pressure ows through valve channel 55, 56, a bore 78,and a conduit 79 into mot-or chamber 61 to urge plunger means 8 to theright. Conduit 79 and bore 78 are circumferentially spaced from conduit58 an-d bore 57, and valve channel 55 has a wider portion 56 covering incircumferential direction the two bores 57 and 78.

While plunger means 8 moves to the right, the volume of pump chamber 5is reduced, and uid is discharged through outlet 2b. The volume of pumpchamber 6 increases, an-d luid is sucked into inlet 3 and passes throughvalve 5t), as described with reference to FIG. l.

When plunger means 8' has reached a position in which its inner surface81 engages the head 83 of valve control member 69, the same is shiftedto the position illustrated in FIG. 6. In this position, valve controlchamber 70 is connected by bore 73, annular room 72, and bore S4 withdischarge conduit 65 in tubular support 13. The pressure of the drivefluid entering into valve channel 55 from conduit 53a is sufficient tourge main valve 54 to the right hand end position when control chamber70 is relieved of pressure.

In both embodiments of the invention, the pump housing 1, 1a, 2 has aninner'cavity which is divided by the partition means 9, 9 into tworooms. The plunger means 8, 10, 11 forms pump chambers 5 and 6 in theirrespective rooms, and motor chambers 26, 28 in the interior of theplunger. The tubular member 8 is sealed from the pump chambers only inthe region of the partition means 9, 9 so that thin annular portions ofpump charnbers extend between housing portion 1a and tubular member 8, 8to the partition. No sealing means .are required between pistons 10, 11and the tubular housing portion 1a. v

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in o-ther types offluid moving machines differing from the types described above.

While the invention has been illustrated and described as embodied in amotor pump combination comprising a plunger having inner motor cham-bersseparated by a partition in which valve means are provided foralternately connecting the motor chambers to a driving fluid, it is notintended to be limited to the details shown, since various modificationsand structural changes may be made without departing in any way from thespirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior ar-t, fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations sho-nld and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be secured by Letters Paten-t is:

1. A fluid moving machine comprising, in combination, housing meansformed with an inner cavity for a pumped fiuid, and including apartition means dividing said cavity into two rooms, each room havingfirst inlet and first outlet means; plunger means including a pair ofpistons located on opposite sides of said partition means in said rooms,and a tubular member connecting said pistons having an axis and beingguided in said partition means, said plunger means defining in each rooma pump chamber communicating with said first inlet and outlet means, andsaid pistons and tubular member defining with said partition means apair of motor chambers located on opposite sides of said partitionmeans; second inlet and outlet means for a driving fluid; and valvemeans mounted in said partition means for connecting said second inletand outlet means and with said motor chambers, said valve means beingformed with first and second conduits and being located centered in saidaxis, said valve means having first and second positions for supplyingsaid driving fluid through said first conduit to said first motorchamber while discharging the same from said second motor chamberthrough said second conduit, and for supplying said driving fluid tosaid second motor chamber through saidsecond conduit while dischargingthe same from said first motor chamber through said first conduit,whereby said plunger means are reciprocated, said first and second valveconduits being arranged and constructed so that the fluid pressuretherein holds said valve member centered in said axis, said valve meansincluding -control means operated by said reciprocating plunger means tomove said valve means alternately to said first and second positions.

2. A machine according to claim l, wherein said control means includetwo Control members having ends projecting in axial direction from saidpartition means, arcuate links connecting said ends and extending aboutsaid valve means, and a piston in a chamber in said partition meansconnected with said valve means, -said control members controlling theflow of fluid in said chamber for turning said valve means.

3. A machine according to claim 1, and including antiriction bearingssupporting the ends of said valve means in said partition means.

4. A machine according to claim l, wherein said valve means includes astepped axially movable piston having a surface subjected to fiuidpressure, and a control chamber means in said partition means receivingsaid piston and having an hydraulically effective annular surface havinga greater area than said surface of said piston, said control chamberbeing hydraulically connected by said control means with said secondinlet and outlet means, respectively.

5. A machine according to claim d, wherein said piston has a circularsurface in said second inlet means subjected to uid pressure, andwherein said annular surface has an area substantially twice the area ofsaid circular surface; and wherein said valve means closes a chamber-connected by a bore in said partition means with said second outletmeans.

6. A uid moving machine comprising, in combination, housing means formedwith an inner cavity having first inlet and outlet means, and includinga partition means dividing said cavity; tubular support means supportedon said housing means and on said partition means and located in saidcavity; cylindrical plunger means located in said cavity and mounted onsaid partition means and said tubular support means for reciprocatingmovement, said plunger means defining in said cavity a pair of pumpchambers, and defining in the interior thereof with said partition meansa pair of motor chambers; valve means mounted in said partition meansfor turning movement between two positions for Connecting one or theother of said motor chambers to the interior of said tubular supportmeans so that a driving fiuid supplied through the same causesreciprocation of said plunger means; a valve control member mounted onsaid partition means and operated by said reciprocating plunger means toshift said valve means between said positions, said valve control memberbeing hydraulically connected with said valve means for shifting thelatter between said two positions when said valve control member isshifted by said reciprocating plunger means.

7. A fiuid moving machine comprising, in combination, housing meansformed with an inner cavity for a pumped fluid, and including apartition means dividing said cavity into two rooms, each room havingfirst inlet and first outlet means; plunger means including a pair ofpistons located on opposite sides of said partition means in said rooms,and a tubular member connecting said pistons and being guided in saidpartition means, said plunger means defining in each room a pump chambercommunicating with said first inlet and outlet means, and said pistonsand tubular member defining with said partition means a pair of motorchambers located on opposite sides of said partition means; a tubularsupport having an axis secured to said housing means extending throughsaid partition means and said pump chambers and motor chambers andpassing through said pistons movably sup porting the same, said tubularsupport being formed with an inner conduit having a second inlet meansat one end of said tubular support and a second outlet means at theother end of said tubular support for admitting and discharging adriving fluid; and valve means mounted in said partition meanscommunicating Wtih said conduit and said second inlet 4and outlet meanson one hand, and with said motor lchambers on the other hand, said Valvemeans being formed with first and second conduits and being locatedcentered in said axis, said valve means having first and secondpositions for supplying said driving fluid through said first conduit tosaid first motor chamber while discharging the same from said secondmotor chamber through said second conduit, andk for supplying saiddriving fiuid to said -se-cond motor charnber through said secondconduit while discharging the same from said first motor chamber throughsaid first conduit whereby said plunger means are reciprocated, saidfirst and second valve conduits being arranged and constructed s-o thatthe fluid pressure therein holds said valve member centered in saidaxis, said valve means including control means operated by saidreciprocating plunger means to move said valve means alternately t0 saidrst and second positions.

8. A iiuid moving machine comprising, in combination,

housing means formed with an inner cavity having first inlet and outletmeans, and including a partition means dividing said cavity; tubularsupport means supported on said housing means and on said partitionmeans and located in said cavi-ty; cylindrical plunger means located insaid cavity and mounted on said partition means and said tubular supportmeans for reciprocating movement, said plunger means defining in saidcavity a pair of pump chambers, and defining in the interior thereofwith said partition means a pair of motor chambers; and valve meansmounted in said partition means for turning movement between twopositions for connecting one or the other of said motor chambers to theinterior of said tubular support means so that a driving fiuid suppliedthrough the same causes reciprocation of said plunger means; and a valvecontrol member mounted on said partition means and operated -by saidreciprocating plunger means to shift said valve means between saidpositions, said valve control means including two valve control membersmounted for translatory movement on said partition means, and beinginterconnected with each other for simultaneous movement, said valvecontrol members being hydraulically connected with said valve means forshifting the latter between said two positions when said valve controlmembers are shifted by said reciprocating plunger means.

9. A machine as set forth in claim 8 wherein said main valve has valvechannels communicating with the interior of said tubular support meansto receive a driving fluid from the same, and wherein said partitionmeans is formed With ducts -controlled by said valve control means forconnecting said valve channels with said motor chambers.

10. A 'luid moving machine comprising, in combination, housing meansformed with an inner cavity having first inlet and outlet means, andincluding a partition means dividing said cavity; tubular support meanssupported on said housing means and on said partition means and locatedin said cavity; cylindrical plunger means located in said cavity andmounted on said partition means and said tubular support means forreciprocating movement, said plunger means dening in said cavity a pairof pump chambers, and defining in the interior thereof with saidpartition means a pair of motor chambers; valve means mounted in saidpartition means and having two positions for connecting one or the otherof said motor chambers to the interior of said tubular support means sothat a driving fluid supplied through the same causes reciprocation ofsaid plunger means; and a valve control member mounted on said partitionmeans and operated by said reciprocating plunger means to shift saidvalve means between said positions; first sealing means 4on theperiphery of said partitioning means in sliding engagement with theinner surface of said cylindrical plunger means; and a ring mounted onsaid housing means and surrounding said cylindrical plunger means in theregion of said partition means and having second sealing means'inengagement with the outer surface of said cylindrical plunger means.

11. A iluid moving machine comprising, in combination, housing meansformed with an inner cavity having first inlet and outlet means, andincluding a partition means dividing said cavity; tubular support meanssupported on said housing means and on said partition means and locatedin said cavity; cylindrical plunger means located .in said cavity andmounted on said partition means and said tubular support means forreciprocating movement, said plunger means dening in said cavity a pairof pump chambers, and defining in the interior thereof with saidpartition means a pair of motor chambers; valve means mounted -in saidparti-tion means for turning movement between two positions forconnecting one or the other of said motor chambers to the interior ofsaid tubular support means so that a driving fluid supplied through thesame causes reciproeation of said plunger means; a valve control membermounted on said partition means and operated by said reciprocatingplunger means to shift said valve means between said positions; andantifriction bearing means at the end of said valve means supporting thesame against axial movement.

References Cited by the Examiner UNITED STATES PATENTS 1,164,926 12/1915Clark. 1,448,486 3/1923 Garraway 230-54 1,487,946 3/1924 Johnston 103-523,152,016 10/1964 Drushella 103--52 X ROBERT M, WALKER, PrimaryExaminer.

1. A FLUID MOVING MACHINE COMPRISING, IN COMBINATION, HOUSING MEANSFORMED WITH AN INNER CAVITY FOR A PUMPED FLUID, AND INCLUDING APARTITION MEANS DIVIDING SAID CAVITY INTO TWO ROOMS, EACH ROOM HAVINGFIRST INLET AND FIRST OUTLET MEANS; PLUNGER MEANS INCLUDING A PAIR OFPISTONS LOCATED ON OPPOSITE SIDES OF SAID PARTITION MEANS IN SAID ROOMS,AND A TUBULAR MEMBER CONNECTING SAID PISTONS HAVING AN AXIS AND BEINGGUIDED IN SAID PARTITION MEANS, SAID PLUNGER MEANS DEFINING IN EACH ROOMA PUMP CHAMBER COMMUNICATING WITH SAID FIRST INLET AND OUTLET MEANS, ANDSAID PISTONS AND TUBULAR MEMBER DEFINING WITH SAID PARTITION MEANS APAIR OF MOTOR CHAMBERS LOCATED ON OPPOSITE SIDES OF SAID PARTITIONMEANS; SECOND INLET AND OUTLET MEANS FOR A DRIVING FLUID; AND VALVEMEANS MOUNTED IN SAID PARTITION MEANS FOR CONNECTING SAID SECOND INLETAND OUTLET MEANS AND WITH SAID MOTOR CHAMBERS, SAID VALVE MEANS BEINGFORMED WITH FIRST AND SECOND CONDUITS AND BEING LOCATED CENTERED IN SAIDAXIS, SAID VALVE MEANS HAVING FIRST AND SECOND POSITIONS FOR SUPPLYINGSAID DRIVING FLUID THROUGH SAID FIRST CONDUIT TO SAID FIRST MOTORCHAMBER WHILE DISCHARGING THE SAME FROM SAID SECOND MOTOR CHAMBERTHROUGH SAID SECOND CONDUIT, AND FOR SUPPLYING SAID DRIVING FLUID TOSAID SECOND MOTOR CHAMBER THROUGH SAID SECOND CONDUIT WHILE DISCHARGINGTHE SAME FROM SAID FIRST MOTOR CHAMBER THROUGH SAID FIRST CONDUIT,WHEREBY SAID PLUNGER MEANS ARE RECIPROCATED, SAID FIRST AND SECOND VALVECONDUITS BEING ARRANGED AND CONSTRUCTED SO THAT THE FLUID PRESSURETHEREIN HOLDS SAID VALVE MEMBER CENTERED IN SAID AXIS, SAID VALVE MEANSINCLUDING CONTROL MEANS OPERATED BY SAID RECIPROCATING PLUNGER MEANS TOMOVE SAID VALVE MEANS ALTERNATELY TO SAID FIRST AND SECOND POSITIONS.